INFO: task syz-executor609:3969 blocked for more than 120 seconds.
      Not tainted 4.4.138-gcf21a9a #62
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor609 D ffff8800b9607ad8 27824  3969   3965 0x20020000
 ffff8800b9607ad8 0000000000000000 ffff8801d73008e0 ffffed003ae6011b
 ffff8801d7300000 ffff8801db21fdb8 ffff8801db21fde0 ffff8801db21f4d8
 ffff8801db21f4c0 ffff8801d7154800 ffff8801d7300000 0000000000000000
Call Trace:
 [<ffffffff838b46ea>] schedule+0x7a/0x1b0 kernel/sched/core.c:3359
 [<ffffffff838b4e83>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3392
 [<ffffffff838bafc7>] __mutex_lock_common kernel/locking/mutex.c:582 [inline]
 [<ffffffff838bafc7>] mutex_lock_nested+0x307/0x850 kernel/locking/mutex.c:621
 [<ffffffff8158477e>] lock_mount+0x8e/0x2c0 fs/namespace.c:2054
 [<ffffffff815874f7>] do_add_mount+0x27/0x340 fs/namespace.c:2443
 [<ffffffff815881b3>] do_new_mount fs/namespace.c:2526 [inline]
 [<ffffffff815881b3>] do_mount+0x5b3/0x2860 fs/namespace.c:2833
 [<ffffffff8162606a>] C_SYSC_mount fs/compat.c:824 [inline]
 [<ffffffff8162606a>] compat_SyS_mount+0x57a/0x1040 fs/compat.c:789
 [<ffffffff81006d96>] do_syscall_32_irqs_on arch/x86/entry/common.c:392 [inline]
 [<ffffffff81006d96>] do_fast_syscall_32+0x326/0x8b0 arch/x86/entry/common.c:459
 [<ffffffff838c406a>] sysenter_flags_fixed+0xd/0x17
1 lock held by syz-executor609/3969:
 #0:  (&sb->s_type->i_mutex_key#13){+.+.+.}, at: [<ffffffff8158477e>] lock_mount+0x8e/0x2c0 fs/namespace.c:2054
Sending NMI to all CPUs:
NMI backtrace for cpu 0
CPU: 0 PID: 491 Comm: khungtaskd Not tainted 4.4.138-gcf21a9a #62
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8800bac14800 task.stack: ffff8800bac38000
RIP: 0010:[<ffffffff810bfb26>]  [<ffffffff810bfb26>] native_apic_mem_write arch/x86/include/asm/apic.h:94 [inline]
RIP: 0010:[<ffffffff810bfb26>]  [<ffffffff810bfb26>] __default_send_IPI_dest_field arch/x86/include/asm/ipi.h:119 [inline]
RIP: 0010:[<ffffffff810bfb26>]  [<ffffffff810bfb26>] _flat_send_IPI_mask arch/x86/kernel/apic/apic_flat_64.c:61 [inline]
RIP: 0010:[<ffffffff810bfb26>]  [<ffffffff810bfb26>] flat_send_IPI_mask+0xf6/0x1a0 arch/x86/kernel/apic/apic_flat_64.c:69
RSP: 0018:ffff8800bac3fcc8  EFLAGS: 00000046
RAX: 0000000003000000 RBX: 0000000000000c00 RCX: 0000000000000000
RDX: 0000000000000c00 RSI: 0000000000000000 RDI: ffffffffff5fb300
RBP: ffff8800bac3fcf0 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000246
R13: 0000000000000003 R14: 0000000000000002 R15: ffffffff8446f6a0
FS:  0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000563350132000 CR3: 00000000bb231000 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff8446f6a0 ffffffff84a18ee0 0000000000000007 fffffbfff0942c8c
 0000000000000040 ffff8800bac3fd10 ffffffff810b5ae1 ffffffff83c0b460
 0000000000000003 ffff8800bac3fd68 ffffffff81e19d83 ffffffff8140dd6f
Call Trace:
 [<ffffffff810b5ae1>] nmi_raise_cpu_backtrace+0x61/0x80 arch/x86/kernel/apic/hw_nmi.c:33
 [<ffffffff81e19d83>] nmi_trigger_all_cpu_backtrace.cold.4+0x70/0xad lib/nmi_backtrace.c:85
 [<ffffffff810b5b84>] arch_trigger_all_cpu_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
 [<ffffffff8141a459>] trigger_all_cpu_backtrace include/linux/nmi.h:44 [inline]
 [<ffffffff8141a459>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff8141a459>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff8141a459>] watchdog.cold.1+0xd3/0xee kernel/hung_task.c:238
 [<ffffffff81190958>] kthread+0x268/0x300 kernel/kthread.c:211
 [<ffffffff838c2b55>] ret_from_fork+0x55/0x80 arch/x86/entry/entry_64.S:510
Code: b3 5f ff f6 c4 10 75 e2 44 89 e8 c1 e0 18 89 04 25 10 b3 5f ff 44 89 f2 09 da 80 cf 04 41 83 fe 02 0f 44 d3 89 14 25 00 b3 5f ff <41> f7 c4 00 02 00 00 75 1a 4c 89 e7 57 9d 0f 1f 44 00 00 e8 02 
NMI backtrace for cpu 1
CPU: 1 PID: 3734 Comm: rsyslogd Not tainted 4.4.138-gcf21a9a #62
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801c799b000 task.stack: ffff8800ac710000
RIP: 0010:[<ffffffff812db753>]  [<ffffffff812db753>] __module_text_address+0x13/0x140 kernel/module.c:4119
RSP: 0018:ffff8800ac717770  EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffff8800ac7178b8 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffff8800ac717858 RDI: ffff8800ac7178b8
RBP: ffff8800ac717788 R08: ffff8800ac7178b8 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffffffffff8000
R13: ffff8800ac7178b8 R14: ffff8800ac717868 R15: 0000000000000000
FS:  00007f20e4d05700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f117929a000 CR3: 00000000b6b27000 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffff8800ac717918 ffff8800ac7178b8 ffffffffffff8000 ffff8800ac7177a0
 ffffffff812e926a ffff8800ac7178b8 ffff8800ac7177b8 ffffffff8118bf4b
 ffff8800ac717890 ffff8800ac717810 ffffffff810167cb ffff8800ac717890
Call Trace:
 [<ffffffff812e926a>] is_module_text_address+0x1a/0x50 kernel/module.c:4104
 [<ffffffff8118bf4b>] __kernel_text_address+0x6b/0xa0 kernel/extable.c:103
 [<ffffffff810167cb>] print_context_stack+0x4b/0xd0 arch/x86/kernel/dumpstack.c:107
 [<ffffffff81015d0a>] dump_trace+0x17a/0x360 arch/x86/kernel/dumpstack_64.c:243
 [<ffffffff81033e46>] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:63
 [<ffffffff814f88d3>] save_stack+0x43/0xd0 mm/kasan/kasan.c:512
 [<ffffffff814f8bb7>] set_track mm/kasan/kasan.c:524 [inline]
 [<ffffffff814f8bb7>] kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:616
 [<ffffffff814f9182>] kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:554
 [<ffffffff814f4f23>] slab_post_alloc_hook mm/slub.c:1349 [inline]
 [<ffffffff814f4f23>] slab_alloc_node mm/slub.c:2615 [inline]
 [<ffffffff814f4f23>] slab_alloc mm/slub.c:2623 [inline]
 [<ffffffff814f4f23>] kmem_cache_alloc_trace+0xc3/0x2c0 mm/slub.c:2640
 [<ffffffff8125be03>] kmalloc include/linux/slab.h:476 [inline]
 [<ffffffff8125be03>] syslog_print kernel/printk/printk.c:1148 [inline]
 [<ffffffff8125be03>] do_syslog+0x603/0xb20 kernel/printk/printk.c:1331
 [<ffffffff8169b484>] kmsg_read+0x74/0xa0 fs/proc/kmsg.c:39
 [<ffffffff81671799>] proc_reg_read+0xf9/0x180 fs/proc/inode.c:202
 [<ffffffff8151c83c>] __vfs_read+0x11c/0x3e0 fs/read_write.c:432
 [<ffffffff8151e630>] vfs_read+0x130/0x360 fs/read_write.c:454
 [<ffffffff81520e39>] SYSC_read fs/read_write.c:569 [inline]
 [<ffffffff81520e39>] SyS_read+0xd9/0x1c0 fs/read_write.c:562
 [<ffffffff838c2725>] entry_SYSCALL_64_fastpath+0x22/0x9e
Code: 48 8b 45 d0 e9 22 fe ff ff 0f 1f 44 00 00 66 2e 0f 1f 84 00 00 00 00 00 55 48 89 e5 41 54 53 48 89 fb 48 83 ec 08 e8 8d fb ff ff <48> 85 c0 0f 84 c4 00 00 00 48 8d b8 d8 01 00 00 48 ba 00 00 00